Sea Mariner
SW 9640 · #434A54 · LRV 7 — cool blue tone, very dark — reads black in most rooms.
- 1Nightlife2
- 2Sea Mariner7
- 3Waterloo13
- 4Charcoal Blue19
What Color Is Sea Mariner, Really?
Sea Mariner reads as a cool blue tone — very dark — reads black in most rooms. The notes below cover how Sherwin-Williams SW 9640 behaves in different light and the closest matches at competing US brands.
Best Rooms and Uses for Sea Mariner
Sea Mariner earns its keep as a statement: accent walls, a front door, cabinetry, a moody powder room, or exterior trim where you want sharp contrast. Blues calm a room, which makes them popular in bedrooms, bathrooms and home offices.
How Lighting Changes Sea Mariner
At LRV 7, Sea Mariner is about as dark as paint gets — it reads near-black on a wall and reveals its character only in direct daylight or under warm bulbs. Its blue undertone is the part to watch: it gets picked up by whatever sits next to it, so test it against your trim, floor and the room's main light before committing. In rooms with little natural light it can feel heavy, so reserve it for spaces you want to feel enveloping.
Most complaints about Sea Mariner are a light mismatch. Upload a photo of your actual room and see it on your walls — then ask for the same wall in north light or evening lamps before you buy a single sample.
Need It From Another Brand?
Any paint counter can custom-tint Sherwin-Williams SW 9640 directly. If you would rather stay in one brand's own deck, these are the closest stock matches, measured as ΔE2000. Under 2 is a difference you will not see on the wall.
| Brand | Closest color | ΔE | LRV | |
|---|---|---|---|---|
| Behr | Dark NightPPF-58 · Behr | 1.7 | 7 | Color page → |
| Benjamin Moore | Hale NavyHC-154 · Benjamin Moore | 0.6 | 8 | Color page → |
| Valspar | Night View4007-4C · Valspar | 3.6 | 6.6 | Color page → |
| PPG / Glidden | Black ForestPPG1012-7 · PPG / Glidden | 3.8 | 7 | Color page → |
| Glidden | Black ForestPPG1012-7 · Glidden | 3.8 | 7 | Color page → |
| Dutch Boy | Navigation432-7DB · Dutch Boy | 3.2 | 7 | Color page → |
Similar Sherwin-Williams Colors
The nearest shades to Sea Mariner within Sherwin-Williams's own range, ranked by perceptual color distance — useful when you want the same look a touch lighter, darker, or warmer.
WCAG 2.1: AA is 4.5 : 1 for normal text, 3 : 1 for large text, AAA is 7 : 1.
Coordinated palette
Generated by hue-rotating #434A54 in HSL space. Pair Sea Mariner with one accent and one neutral — the swatches below are starting points, not final picks.
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